Philips OneBlade Pro QP6520/20, Washable, Battery, Black, Silver Philips OneBlade Pro QP6520/20. Minimum hair length: 0.0157" (0.4 mm), Maximum hair length: 0.394" (1 cm), Display type: LED. Product color: Black, Silver. Power source: Battery, Operating time: 90 min, Battery type: Built-in battery. Width: 5.12" (130 mm), Depth: 3.86" (98 mm), Height: 7.87" (200 mm)